The Fluval A7830 tests water in the following applications:
The Carbonate and Total Hardness Fresh/Salt Water Test is an aquarium tests for fresh and saltwater. This aquarium water test measures carbonate (low levels result in poor plant growth) and general water hardness (to optimize fish species in your tank). This carbonate test includes everything you will need to properly test your water.
Carbonate and Total Hardness Fresh/Salt Water Test specifications: